Process op the manufacture op gas prom coal



June 19, 1928. 1,674,000

M. w. TRAVERS El AL PROCESS OF THE MANUFACTURE OF GAS FROM COAL FiledMarch 5, 1923' lllllllfilllllllllll llll INVENTORS M. W. TRAVERS AND F.W. CLARK,

By their Attorneys,

Patented June 19, 1928.

i have,

UNl'lE STATE All @EFFlQlL MORRIS WILLIAM TRAVERS, OF ALDWYCI-I, LONDON,AND FRANK WILLIAM: CLARK, OF LYMIVI, ENGLAND, ASSIG-NGRS 'IO TBAVERS ANDCLARK, LIMITED, OF IMANCHESTER,

ENGLAND.

PROCESS OF THE MANUFACTURE OF GAS FROM COAL.

Application filed March 5, 1923, Serial No 622,895, and in Great BritainMarch 9, 1922.

This invention relates to the manufacture of gas by a process whichcomprises the toltion chambers; when the temperature of the coke hasbeen sutliciently raised the air is cut oil, and in the other stagesteam is admitted to the bottom of the gasification chamber or it may befor short periods to the top of the gasilication chamber, and during therun the water gas produced in the gasification chamber is allowed totravel through the coal in the carbonization chamber.

Such a process yields gas of the nature of city gas and containing onlya small proportion of nitrogen and carbon dioxide;

e have found that the available sensible heat of the water whethersuperheated within practical limits of temperature or not is, however,insuflicient for the complete carbonization of the coal.

According to this invention and to supply the heat necessary for thecomplete carbonization of the coal we force some of the gas which leavesthe upper part of the carbonization chamber during the run through a'regenerator which has been previously heated by the blow gas anddeliver the gas so heated to the lower partof the carbonization chamben,

Secondary air may be introduced into the reg-enerator so that the airblow gases may be burnt therein and give up also their latent heat.

Thus the quantity of heat passing into the carbonization chamber duringthe run is in excess oi the quantity available from the gas produced bythe action ofthe steam on the coke during the same period and part ofthe heat energy of the fuel gasified during the blow is recovered andutilized regeneratively tor the carbonization ot the coal. a

Our invention is illustrated by the accompanying drawing in whichFigures 1 and 2 are vertical sections through two examples of apparatussuitable for carrying out our improved process.

A is the gasification chamber andB is the carbonization chamber, intowhich coal is fed through a suitable arrangement at C. Beneath the tirebars D are an air inlet E and a steam inlet F. G is a regenerator and atH are orifices through which the air blow gases ca pass into theregenerator and the reheated gas returned from the top of the chamber Bduring the steam run can re-enter the carbonization chamber. At the topof the chamber B is a pipe J through which the gas produced from thecoal during the air blow period can escape or be drawn ofi in determinedvolume by an exhauster K and delivered through a non-return valve intothe outlet main L leading to a gas holder. From the upper part of thecarbonization chamber there is also a pipe L which is connected througha non-return valve to the outlet main leading to a gas holder; pipe L isprovided with a branch pipe Ml which can be closed by av suitable valveN leading through a tan 0 to the top of the regenerator G. An opening Pprovided with a stack valve allows the escape of the waste gases duringthe blow and secondary air can be admitted to the regenerator as forexample through Q.

During the blow period the steam inlet F and the valve N are closed, airis blown in through inlet E and passes up through the coke in thechamber A and through the orifices H into the regenerator where it givesup the major portion of its sensible heat before issuing to wastethrough outlet P. A supply of secondary air may be delivered throughinlet Q so that the air blow gases will be burnt in the regenerator andgive up also their latent heat. lVhen the temperature of the coke hasbeen sufficiently raised air inlets Q and E and outlet P are closed andthe steam is blown in through inlet F and the valve N is opened and thefan 0 started. Thus gas issuing from the top of the chamber B is passedback through pipe M and tan 0 through the regenerator where it isre-heated and it then issues through orificcs H and. heats the coal inthe chamber B to complete carbonization.

W hat we claim is 1. A process for the manufacture from coalot gascarburetted onlyby the products of earbcnisation 0*; the'coal, whichconsists in blowing air during the blow period through hot cokecontained in a chamber into which coal is fed at the top, causing theblow gases thus produced to pass through a regenerator without passingthrough the coal blowin steai'n duringthe run through the coke, passingthe water .gas thus produced through the coal, and forcing a sufficientquantity of said gas to ellect complete carbonization of the coal backthrough the regenerator and directly through the coal without passingthrough the main gasilication zone.

2. A process for the manufacture from coal of gas earburetted only bythe products of carbonization of the coal, which consists in blowing airduring the blow period through hot coke contained in a chamber intowhich coal is ied at the top, causing the blow thus produced to passthrough a regenerator *ithout passing through the coal, burning thegases in said regenerator, blowing steam during the run through thecoke, passing the water as thus produced through the coal, and torcing asuflicient quantity of saidlgas to effect complete carbonization oi thecoal. back through the regenerator to the bottom of the carbonizationzone and directly through the coal without passing through themain'gasiiica-tion Zone.

In testimony that we claim the toregoing as our invention we have signedourvnames this twenty third day of February, 1923.

MORRIS \VILLIAM TRAVERS. FRANK VILLIAM CLARK.

